General data | Classifications | List of species | Local names | Back to home page |
Quercus rex | |
Author | Hemsl. 1899 Hooker's Icon. Pl. 27: t. 2663 |
Synonyms | Cyclobalanopsis
rex (Hemsley) Schottky 1912 fructiseptata A. Camus 1934 Cyclobalanopsis fructiseptata (A. Camus) Hjelmq. 1968 dussaudii Hickel & A.Camus 1921 subumbilicata A.Camus 1935 (A. Camus : n° 71) |
Local names | da
guo qing gang ; |
Range | Myanmar; Laos;
S China (SW Yunnan); NE India (Assam, Arunachal Pradesh ) ; Vietnam ;
1100-1800 m; |
Growth habit | may reach 50
m; |
Leaves | 12-27 cm x 4-9
cm; somewhat crowded at the end of the twigs; coriaceous; obovate to obovate-oblanceolate;
apex acute to shortly acuminate; base cuneate; margin minutely serrate
towards apical half; densely tawny tomentose when young; mature leaves
shiny green and hairless above, hairless and glaucous beneath from more
or less abundant waxy coat; 12-22 vein pairs, impressed or flat above,
such as the midvein, raised below; tertiary veins evident below; epidermis
papillary beneath, hiding the stomata; petiole 2-3 cm long, thick, hairy;
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Flowers | April-May; male
catkins in clusters of 3, thin, drooping; male flowers with perianth 5-lobed,
6 stamens with hairy anthers; female flowers 6-8 styles; |
Fruits | very large acorn
3.5-5 cm in diameter, subglobose, depressed at apex, pale brown; enclosed
1/2 or 1/3 by cup; cup sessil, flat, 1.5-1.8 cm hight, 3.5-6 cm in diameter,
wall 4 mm thick, tomentose, with 7-8 concentric rings marginally entire
or sinuate; basal scar 2-2.5 cm in diameter, impressed; stylopodium often
deciduous; maturing in 1 year in October-November; |
Bark, twigs and |
bark
grey reddish brown; twigs slender, pale brown tomentose at first, becoming
hairless, with many lenticels; deciduous, straight, 2.7 cm long stipules; |
Hardiness zone, habitat | not hardy; dense wet tropical forests in valleys; |
Miscellaneous | --
A. Camus : n° 60; -- Sub-genus Cerris, Section Cyclobalanopsis; -- Section Helferiana, sub-section Helferianae (Menitsky); -- Endangered in China; -- Flora of China n° 24; |
Subspecies and varieties |
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Pictures |
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